Sir John Keith Agnew, 6th Baronet (19 December 1950 – 22 June 2011)^[1][2] was the owner of the Rougham estates in Suffolk, England.

He was the son of Sir George Keith Agnew, fifth Baronet (1918–1994), and his Danish-born wife Baroness Anne Merete Louise Schaffalitzky de Muckadell (Roskilde 1924 – 31 March 2005).^[1]

Agnew was educated at Gresham's School, Holt, from 1964 to 1969 and then at the Royal Agricultural College, Cirencester.^[1] He succeeded to the UK baronetcy (Agnew, of The Planche, Suffolk, created 1895) in 1994.

The Rougham estates include Rougham Airfield, where Agnew organized a wide variety of annual fairs, rallies and events, including the Wings, Wheels & Steam Country Fair, the annual Rougham Air Display & Harvest Fair, and the East Anglian Medieval Battle & Fair. A Rougham Music Festival, of which Agnew's brother and heir George Agnew was the Arts Director, was also held on the estate. Agnew started Green Deserts ^[3] which planned to help stop desertification in the Sudan and elsewhere.

Sir John Agnew of Rougham should not be confused with his cousin John Stuart Agnew of Rougham, farmer, a parliamentary candidate of the UK Independence Party. The title was created for their ancestor Sir William Agnew (1825–1910), a member of parliament and international art dealer, who bought the Rougham estates in 1904.^[4]

Agnew's brother George Anthony Agnew (born 18 August 1953) succeeded him as 7th baronet.^[1]